Jean, of Lachenaie, Que., took the silver medal in the 1,000 metres while Hamelin of Sainte-Julie, Que., captured the bronze in the 1,500-metre.
It was Canada's first medals of the season.
In the men's 1,000-metre final, Jean lead the race up until the last lap when Russian skater Vladimir Grigorev passed him to win in a time of one minute 24.670 seconds. Jean came in at 1:24.813 followed by American J.R. Celski in 1:24.889.
"It (silver medal) feels good. It's the start of the season," said Jean. "Of course I wanted gold to start the season on top of the podium.
"I did some great racing, but it wasn't perfect. I have some homework to do for the 1,000-metre race next weekend in Montreal."
Hamelin could not make up ground on Koreans Jinku Noh, who won gold in a time of 2:14.588, and silver medallist Yook-Gy Kwak (2:14.813). Hamelin had a time of 2:14.871.
"I'm not completely happy (with the bronze medal), I would have liked to be on the highest step of the podium," said the Hamelin, who has 50 World Cup medals. "I did two mistakes in the race the cost me that chance (to win gold). I hope I will do better tomorrow. The 500 metres will be another game."
In the women's 1,000-metre final, Canadian Valerie Maltais, who broke a world record in qualifying Friday, finished in fourth place after received a penalty.
Marie-Eve Drolet of Laterriere, Que., finished sixth in the 1,500-metre final.